Founded by Thracian tribes, archaeological finds near the town testify that its existence dates back to the 5th century BC.

Throughout the centuries, the town has been known under different names including Aetòs (in Greek Αετός meaning eagle), Astòs (Αστός), Eidos (Είδος), Aquilia, Tchengis, etc.

The fortress Aetos took an important part in the defensive system of the Bulgarian lands against the sudden attacks of the Tatars, the Avars and the Crusaders.

[citation needed] The town is located in eastern Bulgaria some 30 kilometers from the Bulgarian Black Sea Coast and belonging to the administrative boundaries of Burgas Province.

The town hosts the annual folk festival and competition Slaveevi Noshti, which takes place every Spring during the months of May and June.